Blessing your enemy is a test of your character. They don’t need your blessing. God could have somebody else bless them. But when you prove to God that you’re not bitter, you’re not vindictive, you’re not holding a grudge, you’re big enough to swallow your pride and bless them, then God knows you’re ready to be promoted.
Jesus said in Luke 6:27 & 28, “Bless those that curse you; do good to those that hurt you; pray for those that mistreat you.” One test we all have to pass is being good to people that have not been good to us.
It won’t make sense to your mind. Everything in you will say, “Hold a grudge. Talk bad about them. Look for ways to get even.” Your job is not to pay people back. Your job is to bless your enemies.